Goodwill and Related Intangible Assets (Schedule of Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance at	$ 292,390
Foreign currency translation	1,274
Balance at	293,664
Accumulated impairment losses	255,530	$ 255,530
Residential Products
Goodwill [Roll Forward]
Balance at	181,285
Foreign currency translation	0
Balance at	181,285
Industrial and Infrastructure Products
Goodwill [Roll Forward]
Balance at	53,704
Foreign currency translation	895
Balance at	54,599
Renewable Energy & Conservation
Goodwill [Roll Forward]
Balance at	57,401
Foreign currency translation	379
Balance at	$ 57,780